Trestle for supporting a scaffold



July 15, 1924.

. H. ANDERSON 'mesma Fon SUPPQRTING A scAFFoLD Filed .April 23 1923 Patented July l5, 1924-,

HERMAN L ANDERSON, OF MINNEAOLIS, MINNESOTA,

muerta For, sorroa'rrne A scArroLD.

Application led April 23, 1823. Serial. No. 633,847.

To all whom t may concern.'

Be it known that I, HERMAN L. ANDER- soN, a citizen of the United States, residing at Minneapolis.y in the county of Hennepin and State of Minnesota7 have invented certain new and Vuseful Improvements in Trestles for Supporting a Scaffold; and I,

do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same.

This vinvention relates to a trestle or jack adapted to support boards or other members forming a scaffold. Such scaffolds are now very commonly used by brick layers, pla-sterers, painters and other workmen where it is Anecessary to work on an elevated surface.

It is an object of this invention to provide a trestle of very ysimple and efficient form i made of standard material and one which can be collapsed into'compaet condition for transpiortation. j

It is a further object of the invention to construct such a trestle mainly from T- shaped bars and angle bars, which trestle also. comprises adjustable legs whereby the height of the trestle may be varied.

Among other objects of the invention are the provision of simple and efficient guiding means for the adjustable legs,f 1neans for holding the same in adjustable position and provision for holding the parts in collapsed condition.

lThese and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to the same parts throughout the different views7 and in which,

Fig. l is a view in side elevation of the device;

F ig.2 is a view in end elevation thereof;

Fig. 3 "is a view in side elevation of the parts in collapsed position;

Fig. 4 is a fragmentary section taken on the line 4 4 of Fig. l;

Fig.k 5-is a transverse section taken on the line 5 5 of Fig. l;

Fig. 6 is a transverse section taken on the line 6 6 of Fig. l; and

Fig. 7 is a partial view similar to Fig. 2 shown on an enlarged Scale and partly in vertical section.

from one end thereof a extends through a hole in the bar 5 and is adapted to be received in any one of the Referring to `the drawings, the device comprises a top sup'portin member l adapted to be'disposed in substantially horizontal position and preferably formed of a T- lshaped bar as clearly shown in Fig. 2.

Pivotally secured adjacent each end of the bar l by headed and netted bolts extending through the main or lvertical member of the T is a pair of diverging members 2, The members 2 are formed of angle bars and are slightly bent at theirwends which are connected to the member l'by headed and nutted bolts la so that one side of the same lies in flat contact with the main or vertical member of the T-shaped member l. Each of the bars 2 is provided with a series of alined apertures 3 extending through one of the sides thereof and preferably, as illustrated, the side which is pivotally connected to the bar l. The members 2 also have secured adjacent their lower ends by rivets, or otherwise7 small channel-shaped members 4, as shown in Fig. 6, which channel members are formed to extend over the edges of the members 2 and also to extend over and embrace the edges of leg members 5 also formedof angle bars adapted to lit and slide in the members 2 and having their edges flush with the edges ofmembers 3. The bars 5 are 'thus guided for sliding movekment in the members 2 by the channels 4 bers 5EL adapted to extend over and embrace the side edges of the bars 2 and 5. Each of the bars 5 also has secured thereto a spring plate or latch member 6 having projecting pin 7. The pin 7 holes 3 in the bars 2 whereby the members 5 can be secured in various positions longitudinally of the bars 2. llhe members 2 also have secured thereto adjacent their 'lower' endsfthe lower ends `of angle bars 'Swhich are pivotally connected at each side of the web or vertical portion of the bar l intermediate the ends thereof there being four of said bars 8. These members 8 are preferably connected together and to the member l by having one flange cut away adjacent their ends which ends are superposed and receive a headed and nutted bolt 9 passing through member l substantially at the center thereof. The ends of members 8 receiving bolt 9 may, if desired, be bent other member 2 ofthe pair, which bolt 13 has a head countersunk into one side ofthe member 2 4and is threaded so thattlie same may be provided with a suitable nut. l

lVhen the device vis set up for use the same is disposed in the position illustrated in Fig. l. The members 2 extend downwardly and the respective pairs thereof diverge andare braced bythe bar ll, as shown `in Fig. 2. The members of the respective pairs also diverge slightly and 4arebracedby the members l1. .'llheleg sections 5 ycan be adjusted to the desired height and will .be guided and kept inclose fitting relation to the members 2 by the channel members #l and 5a. These leg sections 5 can, as stated, be secured in various positions by means of a spring latch 16 andpin 7. A very strong, durable and simple'trestle `isthus provided which can be adjusted to .various heights.

Then it is kdesired to transportthe trestle, the members 8 .will be `disconnected 'from the members 2 andfromthe bolts y13. The latches 6 will be'd'isengaged andthe memtbers 5 slid Vupwardly'on the members 2, the

pin 7 being engaged in the uppermostvhole 3 on the members 2. The nuts on bolts la will now be loosened kand the members 2, together with the members .5 will then be swung about their bolts la and brought into parallel relation to tliemember l and disposed so as to lie along the vertical web of the member 1 and in the anglesfthereof, as shown in Fig. 3. vlt will ,be noted, as shown in Fig. l, that theholes through the members 2 through which bolt, la passes are considerably larger than the diameter of said bolt so ythat the members .2 can be swung' into parallel relation with the member 1. The members 8 will now `be swung upwardly over the member .2 so as to lie inthe angles thereof, and these members will then also be substantially in parallel yrelation to the member l. lhen the members 8 .are lso positioned, the holes 10tlierein -will come into alinement with the bolts la, the nuts can now be removed from vthese bolts and 'bolts `passed through said holes 10 as well as .through the .members 2 when ythe nuts can `again be placed thereon. All kof the members will .then be held in vcompa-ct substantially parallelrelation, as shown in Fig. 3 and the device will occupy small space so that the same can easily be transported.

From `the above description it is seen that applicant has provided an extremely simple, rugged and durable tiestle and one which can read-ily be made from structural iron or steel which is easily procurable. The parts of the device are comparatively -few and the device is extremely simple. rl`he device has been amply demonstrated in actual practice and found to be highly efficient for the purpose intended.

lt will, `of course, be understood, that va- :rious changesmay be made in the form, details, arrangement and proportions of the parts without departing from the scope of applicants inventionv` which, generally stated, consists in a device capableof carrying out the objects above enumerated yand such as shown and described and set forth in the :appended claims.

What is claimed is:

l. A. trestle formed of standard structural steel coinprisi-nga 'horizontally disposed T bar with its central web disposed `vertically and downwardly, a pair of supporting angle bars pivotally bolted through said web-adjacent -each end-of said bar yand alined at opposite sides tliereof,.-said .angle bars-being bent outwardly adjacent their pivots to=di verge downwardly and being.provided-with .spaced holes through one side thereof, an eX- tensionrangle bar itting in and adjustable in `each of said angle bars, latching means tting 4into said holes to hold the latter bars in `adjusted position, means extending between the bars ofeach pair of first mentioned angle bars, and a pair of bracing angle bars pivoted .at each side of said web of said T-bar adjacent its central portion the bars-of each pair extending downwardly in opposite directions to one of the first mentioned angle bars and pivotally secured -t-hereto, said bracing bars beingadapted to .be disconnected at one end and collapsed 1nto closefitting relation with said T bar and with .the supporting .and extension angle bars when the trestle is in folded condition.

2. The structure set forth in claim l, said last mentioned angle bars having holes therein adapted to receive the bolts connecting the first mentioned angle bars to the T- bar when the trestle is in collapsed condition.

In testimony whereof l atliX my. signature.

HERMAN L. ANDERSQN. 

